A well designed MB should reduce recoil and muzzle jump. As others are have already noted, different MBs varies in reduction from one caliber to the next.

My. 270 AI has a 30" barrel with #6 contour was built for 165 to 175 grainers. Recoil is mild but muzzle jump needs to be tamed down. It'll be sporting an MB (stil undecided which one at the moment) after hunting season.